On Mit, 16 Jul 2003, Matthias Schniedermeyer wrote:
> With the upcoming Linux-2.6 Kernel you will be able to burn with full
> speed because the 2.6-Kernel can talk to the burner in DMA mode.
> Current 2.4 Kernel isn't capable of doing this.
On Mit, 16 Jul 2003, Markus Plail wrote:
> That's only true for non 2048 block sizes (audio, (S)VCD, RAW)).
Does this mean
* 2.6+ can talk to burner in DMA for all block sizes
or that
* 2.4 can talk to burner in DMA, but only for 2048 block sizes.
If the later, is there a kernel patch necessary for this? Generally, are
there any patches which would increase the throughput?
On Mit, 16 Jul 2003, Monty wrote:
> Actually, I have 4 52x burners on a UDMA100 chipset (AMD 760MPX
> Southbridge). The hard drives are on their own UDMA133 controller
> (Promise 20269). I can burn to all four at full speed on linux 2.4.20
I have the burner at the secondary IDE controller of my mainboards
VIA686 controller, and the hard disk on my first controller:
----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.37
South Bridge: VIA vt82c686b
Revision: ISA 0x40 IDE 0x6
Highest DMA rate: UDMA100
BM-DMA base: 0xa000
PCI clock: 33.3MHz
Master Read Cycle IRDY: 0ws
Master Write Cycle IRDY: 0ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: yes no
Post Write Buffer: yes no
Enabled: yes yes
Simplex only: no no
Cable Type: 80w 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode: UDMA UDMA UDMA UDMA
Address Setup: 30ns 30ns 30ns 30ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 90ns 90ns 90ns
Data Recovery: 30ns 30ns 30ns 30ns
Cycle Time: 20ns 20ns 60ns 60ns
Transfer Rate: 99.9MB/s 99.9MB/s 33.3MB/s 33.3MB/s
I thought that this is not intrinsically a problem!
Best wishes
Norbert
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Norbert Preining <preining AT logic DOT at> Technische Universit�t Wien
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